Method: Run the do_action function for the asynchronous postback.

Method: Verify the postback is valid, then fire any scheduled events.

Method: Create a random, one time use token.

Method: Verify that the correct nonce was used within the time limit.

Method: Get a nonce action based on the $action property of the class

Method: Constructor to wire up the necessary actions

Method: Add the shutdown action for launching the real postback if we don’t get an exception thrown by prepare_data().

Method: Launch the request on the WordPress shutdown hook

Method: Whitelist shortcodes in content.

Method: The class constructor.